Turn Decision Heads-Up

[GTSamIAm]

This is on Pacific so I'll write it out. I'm in MP1 dealt pocket 7's.

Folds to me. I raise. MP3 coldcalls. SB and BB call.

Flop:

842r

Checks to me. I bet. MP3 folds. SB calls. BB folds.

The turn is an ace.

Against a loose and passive player I'd bet every time. But against a passive board player, should I check and call a river bet? If he has overcards, he has about 10% to beat me. But if he calls the turn, I'm possibly beaten.